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richdel model 100 sprinkler head

I have 40 of these heads around the property. We just moved into the home and I was trying to adjust the spray distance with the screw on top to no avail. I took one apart and noticed that the (for lack of a better term)sleeve that fits into the bottom of the head that is used as a stop for the screw head and subsequently cuts off the water flow is missing. I suspect they are missing on all of the heads. Is ther a way to purchase this part?

I have a number of Richdel Model 100 heads in my orchard. They are workhorses but I also needed a few replacement nozzles. I figured it was just easier to try some different nozzles than go through the hassle of digging up and replacing otherwise quite functional sprinklers.

Rain Bird and Toro nozzles will fit the heads, but the patterns aren't giving me the full 15 ft. range. I'm in the process of trying some Weathermatic 15F nozzles advertised as direct replacements. I'll post a review after they have been in service for a while.